Damage type of tool damage when high hardness of ceramic cutting tool materials, head of the high hardness materials when cutting most of the material surface fragmentation type of injury, appeared shell-shaped chipping at the tool front. Compared with cutting general materials, cutting impedance when cutting high hardness materials is large, especially in the back component is large. This is because after the successive machining tool is worn on the back leaving the back component increases. This increase in the component back means back component and the vertical direction tensile stress acts in the blade, when they exceed the strength of the tool material appeared fragmentation type injury.

In addition also prone to the tool front lose crater wear and sharp tip defect. Both types of damage produced mainly tip temperature. The method of preventing such damage is appropriate to reduce the cutting speed. In summary we can see, the key desire with ceramic tool stably high hardness materials processing is to continue to suppress those long and stable role in the blades of maximum stress, and it decreased.